They do work very nice but keep it on a private range only. The guy at the range with a aftermarket brake is quite the self centered douchbag.
I have asked them, then told them to leave.
Just because nobody can shoot on either side of them.

A problem that, IMO, is worse: semi-auto shooters (esp. AR shooters) that happily let their ejected empties hit the shooter next to them. Why they don't invest the few $$ for a brass catcher on a public range eludes me--

"I have never seen a situation so desperate that the arrival of a policeman did not make worse"
Brendan Behan, Irish poet

I was participating in a match once. The empties from a Garand next to me were hitting me on the head, and they were HOT!
On a whim I had a GI pot and liner in my shooting bag so I put it on. The faint "bink" was no problem.

I also outshot the clown by a huge margin.

Arguing with someone who denounces reason is like administering medicine to a corpse.

These make a rifle louder my neighbor didn t like us cutting wood in my dad's place we were making too much noise. Boy now I really make the place noisy. Adjustable gas plug can help keep brass from flying too far.
Ever have a Garand throw a case up in the air and go down your back ouch that hurts lol.